> Horizontal asymptotes - variables in exponents?

Horizontal asymptotes - variables in exponents?

Posted at: 2014-12-18 
I see that the horizontal asymptotes of

f(x) = (e^x)/(1+e^-x)

is 0. How do you find this? I know how to do it x is the base, but how if it is in the exponent?

I see that the horizontal asymptotes of

f(x) = (e^x)/(1+e^-x)

is 0. How do you find this? I know how to do it x is the base, but how if it is in the exponent?